go to the ULS advanced search page
http://wireless2.fcc.gov/UlsApp/UlsSearch/searchAdvanced.jsp
match only the following radio services CL (800 MHz) and CN (1.9 GHz)
then push the GeoSearch button at the bottom and on the next page
search for whatever state and county you need.
It will return all of the cellular & PCS band licenses in that area.
As far as I know there is no way to search for different modes
like GSM or CDMA.
The cellular carriers don't have site based licenses like private land mobile
so you can't find individual frequencies or sites.
Tom